Chuck.



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IIIIIIIIIIIIIIIII AN.27, 1912. 1,075,353.. Patented Oct. 14, 1913.

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H. E. HELMS.

CHUCK.

APPLICATION FILED JAN. 27, 1912.

Patented Oct. 14, 1913.

2 SfiEETS-SHEET rrc HARRY E. EEIMS, 0F KENOSHA, WISCONSIN.

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To all whom it may concern:

Be it known that I, HARRY E. HELMs, a citizen of the United States, residing in the city of Kenosha, county of Kenosha, and State of Wisconsin, have invented certain new and useful Improvements in Chucks, of which the following is a specification.

This invention relates to improvements in chucks, and refers more articularly to an axial thrust chuck used with metal working lathes.

Among the salient objects of this invention are to produce a construction in which the gripping members and clamping jaws of the chuck are independently pivoted to the head of the latter, to permit the jaws to be clamped over the stock under maximum pressure, while at the same time reducing the danger of breakage to a minimum; to provide a construction in which the pivoted clamping jaws may be easily assembled in position, or independently replaced when necessary; to provide in a construction of the above character resilient means for automatically forcing the jaws apart to release the stock when the axial thrust upon the chuck is discontinued; to provide a construction which can be readily adapted for turning tool stock or small rods of various diameters; to provide a construction adapted for use with standard lathe machines, and which is characterized by its simplicity in construction and in operation; in general, to provide an improved construction of the character referred to.

In the drawings-Figure 1 is a horizontal sectional view of my improved chuck, showing the jaws in open position; Fig. 2 is a front elevation of the same, but with the hood or collet removed; Fig. 3 is a sectional view of the chuck proper, taken on lines 3-3 of Fig. 1 and loo-king in the direction of the arrows; Fig. 4 is a view similar to Fig. 1, but showing a slightly modified construction; Fig. 5 is an end elevation of the construction shown in Fig. 4, but with the hood removed; Fig. 6 is a detail of the split ring which forces the jaws of the chuck apart.

Referring to the drawings, 1 designates as a whole the chuck, comprising a cylindrical body or a head 2, to which is pivoted a plurality of segmental clamping jaws 3.

The shanks 4 of the clamping jaws are provided with axial lugs 5 which extend into sockets 6 formed in the head 2 and are piv- Specification of Letters Patent.

application filed January 27, 1 912.

Patented Oct. 141, 1913. lial NQ- oted thereto by pins 7. For convenience of connection pins 7 are preferably staggered,- as shown in Fig. 1. The heads of the segmental clamping jaws are beveled at their outer faces, as shown at 8, and engage with the inner beveled face of a clamping hood or collet 9, which is threaded as shown at 10 to the chuck holder 11. The latter is integrally connected to a sleeve 12 extending from the shaft of the lathe. The chuck is thrust axially by means of a hollow spindle 13 which engages the adjacent head of the chuck head 2, but is not necessarily attached thereto. The spindle is operated in the usual manner (not shown). When the thrust on the head of the chuck is removed, the latter will automatically spring back to its normal position. When the work is com pleted, it is desirable to be able to readily release the stock from the chuck without stopping the lathe. To this end, within the hollow shank of the chuck, I insert a resilient member, such as a core of rubber 14, which is so arranged as to force the clamping jaws outwardly when the end thrust on the chuck is relieved. The rubber core is merely forced into the hollow shank of the chuck and is preferably tapered, as shown in Fig. 1, no special mechanism being necessary to keep the core in place. It has been found in practice that this rubber core will effectively force the jaws outwardly to-permit the tool stock to be readily removed; at the same time it does not interfere with the clamping pressure of the jaws when the latter are forced into a closed position.

In Figs. 4 to 6, I have shown a somewhat modified construction. In this modification 15 designates the collet or clamping hood, 16 the sleeve to which it is threaded, 17 the hollow spindle which engages the head 18 of the chuck. To this head 18 are pivoted the shank portions 19 of the segmental clamping jaws 20 in the manner heretofore described. This construction is adapted to hold rods or other small tool stock which is to be turned. To this end, within the outer part of the jaws 20 is secured by screws 21 supplemental jaws 22 adapted to fit the size of the rod stock to be turned. The rod stock passes through thehead 18 which is cored for this purpose, and extends into the hollow spindle 17. In order to force the jaws automatically apart when the end thrust on the chuck is released, a split spring ring 23-is inserted in the forward end of the v to pass throu h t.

discontinued.

The invention is not limited to the details of construction shown, except as set forth in the appended claims.

I claim as m invention:

1. The combination with a chuck holder, of a chuck head seated in said holder, a plurality of clamping jaws, each having an enlarged se mental clamping portion and a reduced 5 ank portion, plvotal connection between each shankportlon and the-chuck head, the outer faces, of said segmental clampin portions bein beveled, a 'collet surroun ing the 'aws an acting to force the jaws into close 'osition when the latter are thrust forwar 1y, an annular resilient member seated within said shank portions and acting radially to force the jaws apart when the end thrust on the chuck head is clampin of a chuck head seated in said holder, a

plurality of clamping jaws, each having an enlarge segmental'c amping portion and a reduced shank portion, ivotal connection between each shank portlon and the chuck head, the outer faces of said segmental portions being" beveled, a collet surroun ing the jaws and acting to force the jaws into closed position when the latter are thrust forwardly, an annular resilient member having spring action radial of its axis for forcing the jaws apart when the end thrust on the chuck head is released, and a spindle for axially thrusting the jaws forwardly into engagement with said collet.-

HARRY E. 'HELMS.

Witnesses: I A. E. Boc ms'rsn, MADELENE lDoasEY. 

